Gabe goes to the mall. If n is the number of items he bought, the expression 16.72n + 30 gives the amount he spent in dollars at one store. Then he spent 20 dollars at another
store. Find the expression which represents the amount Gabe spent at the mall. Then estimate
how much Gabe spent if he bought 5 items.
What expression represents the amount in dollars that Gabe spent at the mall?

The rate of decay of a radioactive substance depends upon the amount present initially. the mass y (mg) of the radioactive substance cobalt-60 present in a sample at time t (years) is represented by the exponential equation y=50e −0.1315 t . answer the following questions in complete sentences. 1. how does the exponential equation above compare to the equation for simple interest that is compounded continuously? explain the similarities. 2. what is the initial amount of cobalt-60 in the sample? 2. how much cobalt-60 is left after 8.4 years? show your work. 3. what would be the y-intercept of the graph? what does it represent? 4. after how many years will the amount of cobalt-60 left be 6.25 mg? explain what happens to the cobalt-60 after 50 years? 5. discuss some “real-world” examples and uses of cobalt-60

Which point is a solution to y s 4x + 5?

What is the difference between the equations of a vertical and a horizontal line?